Table 2.

Statistics of datasets used in our experiments.

Datasets	MUTAG	PTC	ENZYMES	PROTEINS	NCI1
Num. of Graphs	188	344	600	1113	4110
Avg. Number of Nodes	14.29	25.56	32.63	39.06	29.87
Avg. Number of Edges	14.69	25.96	62.14	72.82	32.30
Node Attr. (Dim.)	–	–	+(18)	+(1)	–
Num. of Graph Classes	2	2	6	2	2
Num. of Node Classes	7	19	3	3	37